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Here’s just one example of where an experienced engine shop is priceless. The Fed’s push to reduce vehicle emissions has resulted in motor oils in which critical lubrication-enhancing additives have been eliminated. Smeding noticed excessive valvetrain wear on its flat-tappet cam motors, and came up with a simple yet ingenious solution. By notching a 0.012-inch groove into the bottom side of each lifter bore, Smeding is able to dramatically improve oil flow and reduce lifter wear.